Hex Head Self Drilling Roofing Screws 1)Standard: DIN, ASTM,AS,GB 2)Material: Carbon ... :3.5mm~6.3mm,6#~14 Hex Head Self Drilling Roofing Screws 1)Standard: DIN, ASTM,AS,GB2)Material: Carbon Steel ... /4"-5"StandardDIN,ANSIM,ISO,IFIMaterialstainless steeel 410.304.316 and so onHead CodeCSK,pan head,truss head,hexagon head,round ...